﻿/**
 * Copyright (C) 2012-2013 original author and authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using NGuice.Inject;

namespace NGuice.Inject.Util
{
    /// <summary>
    /// 用于创建Provider接口的静态工具方法
    /// </summary>
    public class Providers
    {
        /// <summary>
        /// 总是直接返回instance的提供者实现。这个类不必使用在你的应用中，但对单元测试有作用。
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="instance"></param>
        /// <returns></returns>
        public static IProvider<T> Of<T>(T instance)
        {
            return new InstanceProvider<T>(instance);
        }

        public class InstanceProvider<T> : IProvider<T>
        {
            T instance;
            public InstanceProvider(T instance)
            {
                this.instance = instance;
            }
            public T Get()
            {
                return instance;
            }
            public override string ToString()
            {
                return "Of(" + instance + ")";
            }

            object IProvider.Get()
            {
                return Get();
            }
        }
    }
}
